Air conducting unit for carbon black furnaces



y 1950 c. A. STOKES 2,507,580

AIR CONDUCTING UNIT FOR CARBON BLACK FURNACES Filed July 29, 1947 2 Sheets-Sheet 1 IN V EN TOR.

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May 16, 1950 c. A. STOKES AIR CONDUCTING UNIT FOR CARBON BLACK FURNACES 2 Sheets-Sheet 2 OOOOOOOOOOO Filed July 29, 1947 Patented May 16, 1950 UNITED STATES AIR CONDUCTING UNIT-FOR GARBGN BLACK FURNACES- Charles A. Stokes, Wellesleyf Elli M3551, assignor to Godfrey L. Cabot, Inc.,Bostbri, Missa -"debr poration of Massachusetts Application July 29, 1947;.seri'ai'1tb. ics-277 a 6 Claims.

Stats'Lett'ers Patent No.-2 ,4l8,475, granted April 8,-1-947, on an application of William Loving. It includes in its structure a series of burner pipes spaced apart'to provide air passages and each having? a row of small gas orifices from which, in-

tlie aggregate, issue a multiplicity of wen-distribut'ed gas jets. Air required for partial coinbustio'n is" supplied in a path'passing' through the spaces passing between the burner pipes; I' have discoveredthat improved results in both yield and qua31ity""maybe secured by providing in such a furnacean air conducting unit comprising a pluraiityer metal sheets, articulated with each other, ins'ucha manner as to present a multiplicity of cells which distribute" the air and collectively bring eq'ualamounts' of it to the individual gas orifices.

Preferably and as herein shown, the air conducting unit associated with one or morebaflie plates arranged to make a preliminary division ofthe body of air supplied to the burner; for example, each cell of the unit may be aligned with one'or more perforations in a bafile plate and may thus serve to conduct the air from definite per-- forations of the baflie plate to predetermined or corresponding gas orifices in the burner pipes.

The adoption and use of the novel constuction of my invention results in an unexpected and unpredictable increase in the reinforcing proper Fig. '6 a view in perspective of the air conductingunit,

Fig 7' is a fragmentary view iii-elevation snow: in'g' thereiatich or the perforations iii the. name piate to the air pass'ag'e's'of theunit', and" Fig. 8' ma fragmentarywiewpf a "Hattie plate havin a "different pattern of perforationstnere in. a

As indicated in Fig. '1,"tne*1burner'boicbfmy iii veritionmaybe used advantageouslywitn a "nor-i zonta-ny" disposed furnace comprisins'a general 1yrectangular enclosure'iormed 'b'y a sl'reet steel ties of the resulting product, particularly in asub'stantial' increase in the modulusof rubber compounds in which it is used.

These and other features of the-invention will be: best understood and appreciated from thefollowing description of a preferredembodiment thereof, selected for purposes of illustration and show-n in the accompanying drawings, in which:

Fig. l is" aview showing-a furnace partly in side el'e'v'ation and partly in vertical section,

Fig. 2' is a sectional view on the line' 2 -2 of Fig.1,

'Fig'. 3" is a view in elevation ofone'of the burner pipes.-

Fig". is a sectional view on the line 44 of Fig; {Ilsa view in elevation of a panic plate;

casing idlined withrefract'ory'brick'l '1' An outlet ductfnot shown) is'provi'de'd at theri'ght'ha'nd end of the furnace" as" shownir'i Fig; 1; "In prac: tic'e, the furnace'maype 12 to 14' 'feet inleng'th, and 'ac'cordinglyin Fig. 1" itfis representeda'shavinga s'ectionbrokenfrom it.

The furnace i's'provided'at'its front end with a rectangularop'ening" f2 toreceive individual burne'r b'oxes, oneof which shown in Figs. 1 and 2*. Each of these'comprisJe's" a" sheet'metal rectangular casing 13 flanged and bolted to the casing l0*of the; furnace; Aserie'sof parallel verticallyi disposed -'burner"pipes Mis mounted-in ach burner box 'outs'ide iefumace chamber; These are shbwii' aspeing 'fial sfltipd 61" ova1 cross-section anq'eachfis provided with n row of gas" orifices f5. 'I'h'fiiiies lW-afe "SDSIOEWaDarFtO provide air passages of uniform width between them and arearranged with the gas orifices 15 directed into 'the furnace space. In practice; the flatsides of the-burner pipes Ware-spaced about inch apart-anti their-narrow facesar'e di rected toward the f-urnaceenclosure.--

Gas is supplied to the burner pipes from a low-- er header l6 and an upper header I'Thavi ng individual connections 8 and I9 to the top and bottom of the burner pipes. As herein shown, each burherbox is equipped with six burner pipes, but the precise-number "of pipes employed is of secondary importance. The gas orifices are in the order of inch in diameter and may be spaced 1' inch on centers so that a3 foot bur'nerpipe may be provided witli'about'thirty-three' orm'ces'end in the aggregate each burner-box may present-1 98 well-distributed orifices.

is supplied-to the -burnerbox-byaduct 2m which leadsupwardly into the chamber provided. by the casing l3 and may be provided with a con trolling damper. The casing I3 is provided with atransverse baffieplate --2l having perforations 22 which; as" shown 5'Iale9IlialTgd1fiV8Y gas orifices oi the burner pipes. The construction above described is well known and has been wideiy used heretofore in the carbon black industry as described, for example, in Patent No. 2,418,475 above identified.

The air conducting unit of my invention will now be described in the best form now known to me and in which form it greatly improves the value of 'all carbon black furnaces in which it has been incorporated. Its general construction is best shown in Fig. 6 and its location with respect to the furnace in Fig. 1. As therein shown, it is located between the baflie plate 2| and. the burner pipes M. This comprises a series of rectangular vertical sheets 23 of steel corresponding in number to the burner pipes, and a series of .horizontal sheets 24 of steel corresponding to the .number of gas orifices. The sheets Hand 24 are slotted half way from one edge to the other and brought into interlocking engagement with each other ,so that their opposite edges lie in common parallel planes and the plates themselves define a nest of rectangular air passages or cells of equal dimensions. The plates may be permanently retained in assembled position by spot welding. The assembly may be then placed as a unit within the casing l3 and retained in position by spot welding. The relation of these cells or air passages to the perforations of the bafile plate 2| is well shown in Fig. 7, and it will be understood that each perforation 22 of the baille plate and each passage of the air conducting unit is aligned with one of the gas orifices of a burner pipe.

In Fig. 8 is suggested an alternative form of baffle plate 25 having its perforations arranged in groups of four, that is to say, instead of a single perforation corresponding to a single air passage in the conducting unit, the baffle plate has four smaller perforations arranged within the outline of each air passage. It will be understood that various other arrangements of perforation may be made according to different operating conditions, but in general the purpose of the organization is to provide a structure which will preliminarily break up the full air current in the chamber of the casing 13 into streams of equal volume and conduct these streams to the corresponding gas orifices, thus insuring that all the gas jets shall receive an equal amount of air regardless of the position of any individual jet in the field.

The burner box above described has been operated over a range of gas rates from 3000 c. f. h. to 5000 c. f. h. The general results are indicated in the series of runs listed as follows:

M-burner 3000 c. f. h. gas flow Per Cent or Standard Run Scale Modulus Ten- M-bume'r 4000 c. f. h. gas flow Per Cent 0! Standard Run Scale Modulus Ten- Sile WITHOUT AIR CONDUCTING UNIT WITH AIR CONDUCTING UNIT M -burner 5000 c. f. h. gas flow Per Cent of Standard Run Scale Modulus Tensilc

WITHOUT AIR CONDUCTING UNIT WITH AIR CONDUCTING UNIT It will be noted that in all runs where the air conducting unit was used, the rubber reinforcing properties of the product was decidedly improved as shown by the modulus at 300 and 400% elongation appearing in the last two columns of the table. In addition to the improvement in the quality of the product above noted, the em; ployment of the air conducting unit noticeably increases the yield of carbon black and improves the furnace operating conditions by eliminating coking in the furnace.

Having thus disclosed my invention and described in detail specific embodiments thereof, I claim as new and desire to secure by Letters Patent:

1. An air conducting unit for a carbon black furnace equipped with a series of spaced parallel burner pipes located outside the furnace and providing air passages between them and each having a row of gas orifices directed into the furnace, and an air'chamber leading to the burner pipes containing a transversely disposed perforated baffle plate; the unit comprising a multiplicity of sheet metal partitions interlocked and providing a nest of rectangular air passages between the bafile plate and the burner pipes and located at the opposite side of the burner pipes from the furnace, said air passages being in alignment with the perforations of the said bafile plate. 7

2. An air conducting unit for a carbon black furnace equipped with a series of spaced parallel burner pipes located outside the furnace and providing elongated air passages between them and each having a row of gas orifices directed into the furnace, and an air chamber leading to the burner pipes containing a baffle plate having perforations bearing a predetermined relation to the gas orifices; the unit comprising a plurality of sheet metal partitions intersecting at right angles and providing a plurality of rows of parallel air passages in said chamber and located at the opposite side of the burner pipes from the furnace, said air passages being in alignment with the perforations of the said bafile plate.

3. An air conducting unit for a carbon black furnace equipped with a predetermined number of spaced vertical parallel burner pipes located outside the furnace and defining intermediate air passages and each having a row of burner orifices, and an air chamber leading to the burner pipes and containing a baffle plate housing corresponding rows of perforations; the unit comprising vertical partitions corresponding in number to the burner pipes, and intersecting horizontal partitions providing therewith air passages in the chamber located at the opposite side of the burner pipes from the furnace, said air passages being in alignment with the porforations of the said baffle plate.

4. In a carbon black furnace having pipes presenting a multiplicity of small well-distributed gas orifices, and an air duct leading toward said orifices and containing a perforated baffle plate; a self-contained air conducting unit fitting within the air duct and comprising a plurality of fiat metal sheets slotted and interlocked with each other with their opposite end edges in parallel common planes and in such a manner as to present a multiplicity of equal rectangular cells, each cell being aligned with predetermined gas orifices and with certain perforations of the baflle plate.

5. An air conducting unit for a carbon black furnace equipped with a series of spaced parallel burner pipes each having a row of spaced gas 6 orifices, and an air duct leading to said pipes and containing a perforated bafiie plate; the unit fitting within said air duct and comprising a series of long rectangular metal sheets corresponding in number to the number of burner pipes, and a series of short rectangular metal sheets bearing a predetermined relation to the number of gas orifices, both series of sheets being slotted and interlocked and forming with the duct a multiplicity of gas passages respectively associated with specific gas orifices of the burner pipes and aligned with the perforations of said baflie plate.

6. An air conducting unit for a carbon black furnace equipped with a series of spaced parallel burner pipes providing intermediate air passages and each having a row of spaced gas orifices, an air duct leading to said passages, and a bafiie plate located in the air duct and having a perforation corresponding to each gas orifice; the air conducting unit comprising intersecting partitions located between said baffle plate and the burner pipes and defining an air passage behind each perforation of the baffle plate.

CHARLES A. STOKES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,950,015 Winder et al Mar. 6, 1934 1,950,046 Cone Mar. 6, 1934 1,999,541 Keller Apr. 30, 1935 2,418,475 Loving Apr. 8, 1947 

1. AN AIR CONDUCTING UNIT FOR A CARBON BLACK FURNACE EQUIPPED WITH A SERIES OF SPACED PARALLEL BURNER PIPES LOCATED OUTSIDE THE FURNACE AND PROVIDING AIR PASSAGES BETWEEN THEM AND EACH HAVING A ROW OF GAS ORFICES DIRECTED INTO THE FURNACE, AND AN AIR CHAMBER LEADING TO THE BURNER PIPES CONTAINING A TRANSVERSELY DISPOSED PERFORATED BAFFLE PLATE; THE UNIT COMPRISING A MULTIPLICITY OF SHEET METAL PARTITIONS INTERLOCKED AN PROVIDING A NEST OF RECTANGULAR AIR PASSAGES BETWEEN THE BAFFLE PLATE AND THE BURNER PIPES FROM THE FURNACE, SAID AIR PASSAGES BEING IN ALIGNMENT WITH THE PERFORATIONS OF THE SAID BAFFLE PLATE. 